Assigjstob to the g-oobyeab



B. DARROW.

VULCANIZING APPAHATUS APPLICATION FILED JuL'Y 29.1916.

Patented sept. 13o, 1919.

traue-'a Busenss Darrow, or AKRON, omo,

CGr/EANY,

AssIGNoa 'ro THE encarnar, man a aimera or AKRON, omo, a coaroaa'ron oromo.

vcccanrzme arrarvarus.

mia-wrm Specification of Letters Patent.

retracer, i

application med July 2a, 191s.

To all whom it may concern:

Be it-lnown that I, BURGEss DAR'ROW, a citizen of the United States,residing at Akron, in the county of Summit and State of Ohio, haveinvented new and useful Improvements in Vulcanizing Apparatus, of whichthe following is a specification.

Wy present invention relates to improvements in molds afnd in methods ofcuring pneumatic tires therein by means of hydraulic expansion.

The first attempts to secure proper eXpansion of a pneumatic tire withinits mold by the use of a hydraulic expanding medium were but partiallysuccessful, owing to the leakage of the expanding fluid around the bullring, which resulted from the fact that the bull ring, as customarilyemployed, spaces the lower portions of the two mold parts in separationof the toes of the tire. lt was also a defect in this practice that thebeads of the tire were ver)7 frequently of varying width throughouttheir length, as their toe edges were not uniformly compressed againstthe mold.

Subsequent practice evolved the formation of a flap along the edge ofeach tire toe,-

which was compressed between the sides of the bull ring and the moldparts, which latter were tightened -down upon the bull ring. This edgeflap was a continuation of the fabric of the tire and served to curepreceding practice of the above noted'defects to a'limited extent.Leakage of the expanding fluid was prevented in 'a large degree and thebeads were much more uniform owing to the fact that their toe'edges wereanchored `at the edges of the bull ring, which obviated the formeruneven compression of certain areas of the beads.

This subsequent practice, however, was itself susceptible ofimprovement, and Vit is the object of the present invention to so modifythe method of employing the edge fiap along the toes of the tire, thatall of the defects .in prior vmethods are completely eliminated.

More-specifically, it is the object of my invention to employ a bullring .and mol construction such that the opposite mold parts abutbelowthe bull ring, in providing a seat therefor. By means of thisconstruction, the fabric flaps protrudingfrom the toe edges of the tireare int-erpositioned between the lateral edges of the bull ring'andFatented Sept. 30, ildllt serial No. 112,029.

opposite walls of toe fiap receiving recesses of the mold parts withoutbeing required to bear the entire compression formerly effective thereonupon closing of the mold.

The above and additional objects of av similar nature, which will behereinafter.

' more specifically treated, may be accomplished bysuch means as areillustrated in the accompanying drawings, described in the followingspecifica-tion and then more particularly pointed out in the claimswhich `are appended hereto and form a part of this application.

The figure is a transverse sectional view taken through a mold in whichthere is po sitioned a tire carcass in readiness for its vulcanizationin accordance with the imrovements comprehended by this invention.

The mold illustrated is composed of opposite mating portions 5 and 6,which, along their outer circumference, interlock in the customarymanner as indicated at 7 and, as preferably provided by this invention,are brought into registry along their inner circumferences'by theprovision of'converging base portions or flanges 8--8, which terminatein matingannuli 9 and 10, adapted to abut when the mold is closed.

8-8 are provided with the reception of the toes such seats beingsomewhat narrower than the toes for which they form a support, being cutdown to provide' recessesY which are offset from the seats 11 and areadapted to receive the toe flaps 13 0f the tire. A bull ring ,14: isdisposed within the mold and has its inner face formed to fit theinwardly converging faces of the base portions 8-8 which thus presentthe V shaped annulus illustrated. The usual valve 15 Aextends throughthe bull ring and also through the mating annuli 9 and 10 of the moldbases.V y

'The width of the bull ring is so determined with respect to the mold inwhich it is to be seated The base portions interior seats 11 for of thetire carcass,

that it eXtends only between the recesses l2 provided for the receptionof thel toe flaps. and is. spaced from contact with the oppositetoe-seating anni-1li 1i, perl mitting the flaps 13 to be receivedbetween the sides of the bull ring and the walls of the recesses l2. l

Owing to this structural arrangement ofl the mold and bull ring, the toeflaps 13 do not bear the full force of the compression v pi'odi'iced byan approach of the mold parts 5 and 6 to their mating position. Theabutting annuli -9 and l0 of the base faces are formed to bear .thegreater part of this com- `pressionso that the bull ring is given a snug-tit when-'within itsv mold seat by the interposition of the flaps 13.ample to prevent any leakage of the fluid of expansion around thebiill'ring, and is suli- ,i

0n the other hand, the flaps 13 -arenot crushed in the manner found tobe the almost inevitable result of spacing the mold parts by thebullring, and o-f spacing theull ring from the mold parts by these edgeflaps.' In accordance with the method which this invention seeks toimprove, the `'flaps wei-soften so severel injured, during the forcingtogether of t e mold parts, as not to becapable oli-performing theirleak-v preventing and 4locad-straightening .functions. The presentinvention has cured this fault vby permitting. the loweif parts of the`mold to register directl with each other andto form aseat for t e bullring inthe mannerv 'ust described.

lVht' claim is: Y 1. A tire vulcanizing moldcoinprising opposite matingparts proifided'with base portions formed interiorlywith seats for thetoes of the tire, said hase. ortions hav-v ing interiorly thereof facesw iich converge inwardly toward each other to forma seat, and a ringhaving'one `face formed to fit 'said seat and itssidesadapted to engagesaid tire.

Q. A tire vulcanizing Amold comprising o posite mating parts providedwith abutting base portions formed interiorly'with seats for the toes ofthe tire, saidportions having intei'iorly'thereofv facesl whichconverge-inwardly toward'each other to form a V-shaped seat, and abullring havingone,

face formed to lit said V-shaped seat and` its sides adaptedgto engagesaid tire. l

3. ln arnold for use lin vulcanizing tire casings of the type having'annular flaps `errtending from the toes of the beads inwardly Vtewardtheiaxis of the tire, eoinplen'iental mold sections adapted whenassembled to abut along both their inner andloiitcr circiimferences;inwardly extending :annular base plates toi-med on the-inner portions ofthe mold sections, said base plates liav fing inclined inner faces whichconverge lso in thedireetion of the axis ofthe mold foringing across-sectional A V-shapedl trough l.xinteriorly of the mold 3 annularseats fo i ed at the junction ofthe hase plates an the body portion ofvthe'i'nold sections to receive the tire beads when the tire is-placed'in the mold; parallel annular ledges extend- The. snug lit isA beinginclined Ysurfacesfof the bull rin adapted tioseat `upon the inclinedacesof.

the .base plates; and inwardly. vprojecting :faces defining itslinne'rcircumference, saidl annular flanges vformed on the Vbase .plates andarranged to'abutvvhenl tliemold- Sections 'are assembled to causethe'spaeing of the sides of'. the bull ring'fromfthe' ledges l to such adegree that thel tlap'sof the tire.

ma be snugly clamped-between the ledges an vthe side faces of tlievbullring but not linjured through severity of. compression.

4; A tire vulcanizi'ng mold coinprisii'ifg opposite ymatingl partsprovided with Ybase flanges formed interiorly withv 'seats forthetoes-of. the tire, the flanges being provided interioily thereof withfaces which fcon- .'erge inwardly towaideach .other to' form 'a seat,and said'flanges having recesses to receive flaps on said toes, `and aringhav-- -ing its inner' face formed toditfsaid seatand vits sidesadapted to engage said flaps.

5. Ar tire vulcanizing mold comprising ting 'base flanges formediiite'i'iorly with being provided inteiiorly4 thereof wit-li facesopposite mating parts provided with ablltseatsfor the toes of thetire,'the base flanges which eoiivei'g, inwardly tmvajrdeach other .toform a-V-shapedl seat,'-ai idfsaid flanges having recesses toi'cceive'tlapson 'said toes,

and a hull-ring having its inner face formed to fit said V-shaped seat`and its 4sides adapted to engage sa-id flaps. Y J6. A tii'e vulcaniziiigmold comprising opposite mating parts provided with ahut`- vting hase,flangesforined interiorly with seats for the toes olf' the tire, theYflangesheingprovid'ed interiorly thereofwith faces which convergeinwardly toward `each other lo forni a seat,ai`id said flanges havingflap receiving' recesses disposed between the last `named seat andthetoc seats, and aiii'ig hav;

ing its iiiiierfface vformed to fit said seat and its sldesadapted t'opress lapsoii said toes againsttlie walls ol said recesses.k

7. A tire. vulcanizing moldcomprising opposite mating parts providedwithbase flanges terminating in abutting annu-li' at the innercircumference of the moldand' formed' interioily `with seats' for-fthetoes vf/thetire, said flanges liavingginteriorly Ihereof faces which Yconverge inwardly toward each other to foi-m a seat, and a ring havingits iniierface formed to lit said seat ,i

and 'its sides adapted to'v engage said tire;v

8; A- tire vulcanizing mold comprising opposite mating partslprovided-with bas, flanges terminating 'iniabutting annuli at r theinner circumference of thefmold and 'formed Ainteriorly with seats' forthe toes of the tire, the flanges beingv provided intriorly thereofWithvfacesl which-converge i being offset from said to2 seats,

inwardly toward each other to form a seat, and said flanges having flapreceiving re'- cesses disposed between the last named seat and the toeseats, and a' ring having its inner face formed to f it said seat andits sides adapted to' press aps on said toes against the walls of saidrecesses.

9. A tire vulcanizing mold comprising .opposite matingparts providedwith base flanges terminatlng 1n abutting annuli at the innercircumference of the mold and 10. A tire vulcamzving mold comprising iopposite mating parts having abutting converging base flanges,

ing formed interiorly with seats for the' toes of the tire carcass andwith flap re-v ceiving recesses which are voffset from the -)acent theirinner and said base flanges bee seats and provide abutments for fiaps onthe toes of the tire, said seats being somewhat narrower than the toesfor which they form a.support, said flanges 4having interiorly thereoffaces which converge toward each other and form a seat, and a bull-ringhaving its inner face formed to fit on said seat and its sides adaptedto press said iaps l against said abutments.

11. A tire ,vulcanizing vapparatus comrising mating mold sectionsabutting adouter circumferences to bear the force of compression, eachsection having a tire bead toe-engaging surface, anv inwardly inclinedring-engaging surface, and a toe-flap-engaging surface between the ringand the toe-engaging surfaces, vand a bull-ring seated on theringvengaging surfaces and adapted -to engage iaps on the tire beaddisposable between the sides of the bull ring and the flap engagingsurfaces of the mold sections.

lIn testimony whereof I have signed my name in the presence of twosubscribing witnesses.

I Witnesses:

L. E WAGNER, F. C. RoTHRooK.

BURGEss DARsow.

